Grinding-mill.



A. A. WARNER.

GRINDING MILL. 'APPLIGATION FILED DBO.2.1907.

Patented Nov. 24, 1908.

2 SHEETS-SHEET -1.

@Messes A. A. WARNER.

GRINDING MILL.A

APPLICATION FILED DBG.2,1907.

2 SHEETS-SHEET 2.

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UNTTED STATFS .PATFAN T OFFTCE.

ALONZO A. WARNER, OF NEW BRITAIN, OONNEOTTOUT, ASSlG-NOR TO LANDERS, FRA RY AND CLARK, OF NEW BRITAIN, CONNECTICUT, A CORPORATION.

GRINDING-MILL.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed December 2, 1907. Serial No. 404,811.

To all whom it may concern:

Be it known that I, ALoNzo Ar. lVARNnn, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have `invented certain new and useful Improvements in Grinding- Mills, of which the following is a specifica tion.

My invention relates to improvements in grinding mills, and the main object of my improvement is efficiency in operation, espeeially with reference to rapid grinding.

In the accompanying drawing: Figure l is a face view of the rotary mill disk for my grinding mill. Fig. Q is a broken out side elevation of my mill with the rotary mill disk removed so as to show the face of the stationary mill disk. Fig. 3 is a like View of the ease with both mill disks and the forcer removed. Fig. I is a vertical section of portions of my mill on the lines :c a: of Figs. l and 2. Fig. 5 is a vertical section of the said mill on the line g/ y of Fig. 1f. Fig. t is a sectional view of the rotary mill disk on the line s s of Fig. 1.

My mill is especially adapted for grinding corn but is found in practice to be very efficient for grinding coffee and spices and the like.

The case A, in its general form is what may be called cylindrical as it is adapted for use with a substantially cylindrical feed screw or forcer G. It may be provided with any suitable or ordinary standard 7 for holding it in place. At the top there is a subhopper S cast on the case and to this is fitted the main hopper 9, or hopper extension, which is preferably formed of sheet metal. At the delivery end of the case is a flange 10 to which the hxed or stationary mill disk 11 is secured in any proper manner, as for example by bolts 12 and nuts 13. The interior wall for the main portion of the ease, particularly between the hopper and the fixed disk, is substantially of a cylindrical form and is of a larger diameter than the periphery of the screw or forcer. The fixed mill disk is mounted on the case eccentrieally to the said interior wall. The ends of the points or teeth at the inner edge of the said disk, and the adjacent part of the case serve as the bearing for the delivery end of the forcer, the periphery of the said forcer being fitted to the said bearing.

The other end of the forcer is provided with a journal 23 that takes its bearing in the end wall of the case, which end wall is bored eccentrically to the interior cylindrical wall of the case, so that the lower side of the forcer comes closely to the said interior wall at t-he bottom of the ease, while a space is left between the said wall at the top and sides of the forcer. A central longitudinal feeding rib 14C is formed on the interior of the case at the top of its inner cylindrical wall and similar ribs 15 are formed thereon on the two sides, the tops of these ribs and the case at the bottom being fitted to the periphery of the forcer as best shown in Fig. 5. The delivery end of the case is provided with eight longitudinally extended teeth lli or short ribs with outwardl y flaring spaces 1T between the respective teeth. The ends of these teeth are designed to substantially fit the periphery of the forcer. Three of these teeth, namely, those in alinement, with the ribs 14 and l5, are formed on the outer ends of the said ribs. The depths of the feeding ribs and of the spaces 17 between the teeth 16 are indicated by broken lines in Fig. et. The efficiency of the feed depends largely upon the length of the cylindrical portion of the case between the hopper and the fixed disk.

The fixed grinding disk 11 is provided with a central opening surrounding which there are eight longitudinally extended teeth 18 with spaces between, that extend completely through the said disk in the longitudinal direction of the case and forni notches through the inner edge of the said disk, the said teeth and spaces being designed as a continuation of the teeth and spaces 1G and 1T of the case, and they have the same relation to the forcer, the disk like portion of which is within the circle 'formed by the inner ends of the teeth 1S and takes its bearing therein.

The forcer (3 is of an ordinary form of grooved screw, and is provided with a disklike end 11.9 that substantially tills the circle inside of the points of the teeth 1S while the grooves in the screw of the forcer run out or vanish at the periphery upon reaching the disk-like end 19, so that all the feed at this point is outside of the diameter of the forcer through the outwardly flaring and longitudinally extended spaces between the respective teeth of the case and fixed disk. This end of the forcer is also provided with a noncircular disk seat 20, and a screw threaded stem 21 for the attachment ot the rotary grinding disk 26 in an ordinary manner, the

has a journal 253 that takes its bearing in the end ot the case, while an ordinary crank 2-t is attached to the outer end oit the torcer. As shown thereis a pair of ball bearing disks 25 between the crank hub and end of the case, but this not ot my present invention.

The mill disks 11 and 26, are constructed in substantial accordance with my Patent No. 782,293, dated Feb. lt, 1905. s in the atoreA said patent the Jface ot each mill disk is divided into `several sets ot teeth one ot which is a long Hat topped tooth 2T, with a broad face at its inner end and its outer end divided into two finer teeth by means ot the groove 28. These fiat topped teeth stand up boldly above the teeth on either side thereo't'. As herein shown there are eight ot these long flat topped teeth with intermediate teeth oi'' less projection at their inner ends, while the outer ends of all the teeth at and near the edges of the disks are substantially in one plane to torni an annular bearing contact as in the aforesaid patent. The inner ends ot these tlat topped teeth 27, in the tixed disk 11, as shown in Fig. 2, are formed on the disk faces ot the longitudinally extendedteeth or points 18, and the spaces between the points in the torni of notches through the inner edge orp the disk which notches substantially follow the length ot these teeth 27 on one side, for nearly their tull depth, and then curve gradually away from the said teeth to the inner end ot' the next l'lat topped tooth, so that the inner ends oi all the teeth in each set, other than the tlat topped teeth, terminate in the spaces between the inner ends ot the teeth 27. 1n the faces of these long and flat topped teeth 2T, in both disks, 1 form recesses or breaks 29 for the better distribution of the material as it nears the outer edges ot' the grinding disks. l also torni breaks 30 towards the inner ends in a plurality ot' the intermediate teeth oit each set in the fixed mill disk in order to give a better hold on the material being ground.

Upon turning the crank, when the mill is supplied with material to be ground. so as to rotate the forcer and rotary disk, the torcer and ribbed case coact to feed the material forwardly towards the delivery end ot the case. rllhe torcer substantially wipes the lower part ot the inner cylindrical wall ot the case so as to torce along all the material at the bottom, even that which is quite fine. Then the space between the periphery of the forcer and the inner wall ot' the case above the torcer becomes filled the material therein may be cracked or crushed by the coaction of the feeding ribs and the forcer.

This torcer has an unbroken smooth periphery .tor continuous action upon the unbroken feeding ribs and any crushing action that it may have is only incidental to the feeding action. As it reaches the grinding disks, the material is torced outwardly and for 'ardly through the spaces 17 in the end ot the case. and spaces between the inner ends ot the teeth 27, from which spaces it radiates outwardly and ground between the toothed taces ot the two mill disks. A mill of this construction is a very rapid grinder.

l claim as my invention:

1. 1n a grinding mill, the combination oiu a case having an inner cylindrical wall pro vided with a lplain suriace at its lower part and feeding ribs at its upper part, with a screw torcer mounted in the said case in bearings arranged eccentrically to the said inner cylindrical wall with its periphery closely approaching the plain surface of the said inner wall and the tops of the several feeding ribs, and mill disks at the delivery end of the said case.

2. In a grinding mill, the combination of a case having an inner cylindrical wall andl feeding ribs with a screw torcer having a disk like portion at its-delivery end, and a pair of mill disks, one of which is fixed on the case and the other of which is mounted on the delivery end ot the said torcer, the said iixed disk having a series of longitudinally extended teeth with outwardly flaring intermediate open spaces immediately suru rounding the said disk like portion of the torcer.

3. ln a grinding mill, a case having an inner cylindrical wall, a series of teeth with outwardly Haring spaces between at the grinding end ot the said case, the said spaces extending outwardly from the said inner cylindrical wall, in combination with a mill disk mounted in a fixed position on one end of the said case, the said disk having its tace divided into several sets ot' teeth one of which teeth in each set is a long tlat topped tooth with a broad tace at its inner end, a forcer with its end fitted within the circle formed by the longitudinally extended inner ends of the said long flat topped teeth, and a companion mill disk mounted on the outer end ot the said torcer, the said fixed disk having open spaces therethrough in the form ot notches at its inner edge, the said ends and spaces at the inner edge of the said disk being formed in continuation of the teeth and outwardly flaring spaces at the grinding end of the said case.

4. ln a grinding mill, the herein described mill disk having a series of teeth arranged in several sets each set comprising one broad and substantially tiattopped tooth and a plurality of tiner teeth7 the inner end of the said flat topped tooth standing above the tops of the said finer teeth, the tace of the Cgi said broad and Hat topped tooth being broken by a transverse recess extendingl across the saine towards its outer end.

5. In a grinding inill, the herein described niill disk having a series ot' teeth arranged in several sets,` one ot` which teeth in each set is provided with a broad flat top at its inner end that stands above the tops o't the other teeth at their inner ends, the 'tace ot t-he said broad topped tooth being broken by a transverse recess extending across the saine to vards its outer' end.` a plurality otl the intermediate teeth in each set also being broken towards their inner ends by transverse recesses extending across the saine.

6. In a grinding niill, the combination oit' a ease having an inner cylindrical Vall with l a fixed inill disk lnounted on one end ot' the i said case, the said disk having an imperfoy rate grinding face inside o its outer edge and having at its inner edge a circular series of longitudinally extended teeth with intermediate spaces in the forni ole2 notches through the said inner edge that `flare outwardly t'roin the said inner cylindrical wall of the ease, a 'torcer having a screw thread and a disk-like end that substantially tills the. said Circular series ot' longitudinally extended teeth at the inner edge ot' the said disk, while the groove in the it'oreer runs out at' the periphery ot' the t'oreer upon reaching the edge ot said disk-like end, thus stopping short ot the end t'aee ot the said forcer, and a rotary niill disk n'iounted on the outer end of the torcer and having an impert'orate grinding t'ace thaty ('overs the said open spaces through the inner edge of the said fixed disk.

ALONZO A. WTARNER. Titnesses H. A. Tnavnn, LEROY lll'. PAGE. 

